System and method for generating signal waveforms in a CDMA cellular telephone system
First Claim
1. A mobile unit, comprising:
- means for receiving a signal that contains a stream of interleaved code symbols and includes power adjustment commands that have been provided in the signal by replacing code symbols that would otherwise be contained in the signal;
first means for adjusting a power level of a transmit signal in response to the power adjustment commands; and
second means for adjusting the power level of the transmit signal in response to a power level of the signal.
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Accused Products
Abstract
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the exemplary embodiment, transmit power of mobile unit signals is controlled based on signal power received by the mobile unit and power adjustment commands sent to the mobile unit.
170 Citations
15 Claims
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1. A mobile unit, comprising:
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means for receiving a signal that contains a stream of interleaved code symbols and includes power adjustment commands that have been provided in the signal by replacing code symbols that would otherwise be contained in the signal; first means for adjusting a power level of a transmit signal in response to the power adjustment commands; and second means for adjusting the power level of the transmit signal in response to a power level of the signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling a power level of a transmit signal, comprising:
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receiving a signal that contains a stream of interleaved code symbols and includes power adjustment commands that have been provided in the signal by replacing code symbols that would otherwise be contained in the signal; controlling a power level of a transmit signal in response to the power adjustment commands; and adjusting the power level of the transmit signal in response to a power level of the signal. - View Dependent Claims (7, 8, 9, 10)
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11. A mobile unit, comprising:
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a receiver configured to receive and demodulate a signal having a received power level, wherein the signal contains a stream of interleaved code symbols and includes power adjustment commands that have been provided in the signal by replacing code symbols that would otherwise be contained in the signal; a control processor coupled to the receiver and configured to receive the power adjustment commands from the receiver and generate therefrom a first control signal; an automatic gain control (AGC) circuit coupled to the receiver and configured to generate a second control signal based on the received power level of the signal; and power control circuitry coupled to the control processor and the AGC circuit and configured to receive the first control signal from the control processor and adjust a power level of a transmit signal in accordance with the first control signal, and to receive the second control signal from the AGC circuit and adjust the power level of the transmit signal based on the second control signal. - View Dependent Claims (12, 13, 14, 15)
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Specification